error[E0308]: `match` arms have incompatible types --> $DIR/issue-17728.rs:108:14 | LL | / match to_parse { LL | | "w" | "west" => RoomDirection::West, LL | | "e" | "east" => RoomDirection::East, LL | | "n" | "north" => RoomDirection::North, ... | LL | | "down" => RoomDirection::Down, | | ------------------- this and all prior arms are found to be of type `RoomDirection` LL | | _ => None | | ^^^^ expected enum `RoomDirection`, found enum `Option` LL | | } | |_____- `match` arms have incompatible types | = note: expected enum `RoomDirection` found enum `Option<_>` error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.